7 segment display controlled by simple SPI interface

Touch let us know about these 4 digit SPI controlled 7 segment displays that cost a little less then $1 a piece. They include decimal separators and a colon separator so it’s easy to display time.

I picked up some cheap 4 digit 7 segment displays over on eBay for $10 + shipping. They Include a SPI PT6961 driver chip built in that deals with PWM and Multiplexing, saves on microcontroller ports & current limiting resistors. Figured someone here may have a use for them!

Via the forum.

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  1. 10 pieces of 4-digit displays with controllers for $10 total sounds like a really good deal – that is if you’re US-based and paying only $3.75 for shipping.

    Overseas customers have to pay $30 for shipping for $10 in parts :-(

  2. Ya, I’ve seen these around for awhile. Alas, there are no six-digit with separating colons for a “real” clock display. You really can’t chain them as there are missing colons. Too bad. So I guess it is back to building six digit clock displays from discrete 7-seg LED’s and a uC “backpack” to mux/drive them. Something I’ve got on my to-do list (or maybe someone has seen a six-digit clock display?).

  3. From the picture, it looks like you could use just two discrete green LEDs in between adjacent 88:88 blocks and have a colon display that would match pretty well with the spacing on the built-in center one.

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